Reaction engineering parameters of the carbothermal production of beta'-sialon from kaolin

A.M. Neerven, van, F. Blömer, R. Metselaar

Research output: Chapter in Book/Report/Conference proceedingChapterAcademic


The grain model has shown to be an appropriate reaction engineering model for the carbothermal production of beta-sialon from kaolin when pelletized mixtures of kaolin and coal are used as starting materials. When pellet size is below 1 mm in diameter (spherical pellets) pore diffusion can be neglected and the overall rate is controlled by the chemical reaction rate. Above this size, pore diffusion shows a significant influence. This holds for reaction temperatures of 1400°C. The apparent activation energy is about 400 kJ/mole. When the CO partial pressure is kept below 0.05 atm., at 1400°C relatively simple reactor design calculations can be used. Under these conditions the formation of beta-sialon can be treated as an elementary reaction. In general at least two steps of the complex reaction scheme are rate determining. This means that in order to achieve a reliable model, these steps should be distinguished. Experimental procedures should be developed to enable elucidation and separate modelling of these steps.
Original languageEnglish
Title of host publicationProcessing ceramics
EditorsG. With, de, R.A. Terpstra, R. Metselaar
Place of PublicationLondon
PublisherElsevier Applied Science Publishers
ISBN (Print)1-85166-430-0
Publication statusPublished - 1989

Publication series

NameEuro-ceramics : European Ceramic Society conference (ECerS) : proceedings


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